feat: preserve line breaks from original input

[mcwarman]

Motivation

Preserve the line breaks from input.

We use this project as dependency in a project that round trips YAML, this attempts to try and preserve the formatting. It will only ever add one line break between lines regardless of input.

Changes

• add checkLineBreak method that uses the previous token to calculate if there should be a line break
• account for token.SequenceEntryType using the previous token of that.
• ensure multiline strings are accounted for in the logic
• add a new table test
• update existing test to validate string output has changed
• update existing tests to output differences on failure

Checks

• Describe the purpose for which you created this PR.
• Create test code that corresponds to the modification

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.03%. Comparing base (0640a15) to head (7e17e11).
Report is 30 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   76.02%   78.03%   +2.00%     
==========================================
  Files          13       18       +5     
  Lines        4692     5922    +1230     
==========================================
+ Hits         3567     4621    +1054     
- Misses        866     1028     +162     
- Partials      259      273      +14     

[mcwarman]

@goccy I'd be interested to get your thoughts on this.

If you specifically have reservations/thoughts on how the change could be behind a feature flag for backwards compatibility, let me know.

[olblak]

@goccy Kindly pinging you in cased you missed the previous notification.
It would be awesome to see this pullrequest moving forward

[olblak]

Hi @goccy,

I could see you spend some time recently on this great library.
Would you have some time to accept this pullrequest?
Thanks in advance

[goccy]

LGTM 👍 Please fix typo